few articles report that, fluorescence remains constant in ethanol dehydrated tissue upto 30 min (not given data after that time point). Addition of hexane decreased it to more than 50%.
1. Fluorescence quantum yield is polarity sensitive. It changes with the polarity of the solvent.
2. In non-polar solvents, the solubility of the particles can decrease leading to aggregation. Aggregates can have lower fluorescence quantum yield leading to lower fluorescence intensity.
in that case if i change solvent to nonpolar from polar, i loose fluorescence and if i revert back solvent i can bring it back. and if the organic solvent is polar fluorescence should not be decreased. am i correct?